There are a number of different methods of wiring a vehicle for towing depending on what is required.

Your vehicle probably uses a CAN-bus system and great care must be used when wiring for towing unless a genuine Nissan wiring harness is used. What fuses used and where they might be is something I am unable to comment about.

Wiring for towing and the wiring and lighting of trailers, campers, caravans are notoriously unreliable and short-lived unless completed to a very high standard and superior materials are used. When there is a fault it could be caused by either and it is important to suspect both and test both independently.

The first step should be to eliminate the camper, trailer or caravan as a possible cause by either plugging it in to another vehicle or using a substitution or testing box or device.
I have such a box that is invaluable to people who tow. It allows me to test the vehicle wiring and the trailer wiring.

Alternatively you could try plugging a known good trailer onto your vehicle for test purposes. It it is decided the vehicle is at fault it usually pays to examine the inside of the socket first to check for corrosion. I recently encountered a socket that was full of water and so badly corroded a couple of feet of the wiring had to be replaced. - and it had happened in only a year...

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First check the fuses. There may be one for trailer running lights. Check also power at the harness. If the brake lights and turn signals are seperate, there has to be a converter from 5 to 4 wire. For the power to feed back to the brake lights it sounds like the vehicle wiring is direct and not using a converter... or one of the bulbs on the trailer is contacting both contacts. Try http://www.etrailer.com/faq-wiring.aspx and maybe get a simple 4 pin tester that plugs into the 4 pin connecter. Hope this helps.

the lights you have on are probably the brake lights. you need to check the brake light switch. it is probably stuck in the on position and that would cause the cruise to not function properly because the cruise automatically shuts off when you press the brake pedal.hope this helps!